地球物理学进展 ›› 2017, Vol. 32 ›› Issue (6): 2650-2654.doi: 10.6038/pg20170648

• 应用地球物理学Ⅱ • 上一篇    下一篇

鬼波衰减在深水多次波衰减中的作用

李慧龙1, 王慕雨2, 王子秋1, 张广智3, 石孟常1, 麻志国1   

  1. 1. 中海油田服务股份有限公司物探事业部, 天津 300451;
    2. 西南石油大学化学工程与工艺专业, 成都 610500;
    3. 中国石油大学(华东)地球科学与技术学院, 山东青岛 266580
  • 收稿日期:2017-04-22 修回日期:2017-10-21 出版日期:2017-12-20 发布日期:2017-12-20
  • 作者简介:李慧龙,男,1984年生,汉族,工程师,主要从事地球物理勘探数据处理及野外质控工作.(E-mail:lechr@163.com)

Effect of deghosting for multiple attenuation in the deep water

LI Hui-long1, WANG Mu-yu2, WANG Zi-qiu1, ZHANG Guang-zhi3, SHI Meng-chang1, MA Zhi-guo1   

  1. 1. Geophysical-China Oilfield Services Limited, TianJin 300451, China;
    2. College Chemistry and Chemical Engineering Southwest Petroleum University, Chengdu 610500, China;
    3. School of Geosciences China University of Petroleum, Shandong Qingdao 266580, China
  • Received:2017-04-22 Revised:2017-10-21 Online:2017-12-20 Published:2017-12-20

摘要:

深水资料中与海面及海底有关的多次波比较发育,能量很强,几乎完全掩盖深部一次反射波,严重影响地震剖面质量,运用针对性的多次波衰减方法进行衰减后,仍然有较强的剩余能量残留.根据鬼波的形成机理及特点,作者提出了二次鬼波概念,认为二次鬼波的存在影响了多次波的衰减效果,需要对二次鬼波进行针对性的分析.本文在前人研究的基础上推导了二次鬼波走时方程,分析了二次鬼波衰减原理;通过模型与实际数据对比了波动方程预测相减法与去鬼波加波动方程结合衰减多次波效果.提出了深水多次波衰减中鬼波衰减的必要性.

Abstract:

The sea surface and sea bottom related multiple which covers effective reflection wave of deep layer and affects seriously quality of seismic data is very strong in deepwater seismic data. The residual multiple still exists after using targeted multiple attenuation. The author derives the second ghost concept by the mechanism of ghost and thinks the attenuation effect of multiple waves is affected by the second ghost which should be specially attenuated. In this paper, The author derives the second ghost travel-time equation and the principle of the second ghost attenuation is analyzed. The deepwater multiple separately was attenuated by application of the predictive method basing on wave equation and combinations of deghost and predictive method. The author compares effect of the two kinds of method on model and real data and emphasizes the importance of deghost in the multiple attenuation.

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